III. Divisions of Hierarchy
The ranks of Mazoku are traditionally divided into five groups, and can more practically in the modern Red World be divided into four groups.These groups are a type of peerage based on the Lord a particular Mazoku is affiliated with, and are often referred to as camps, houses, or armies.
This discrepancy between five historical camps and four practical camps is due to the defeat of Hellmaster during the Kouma war. The ranks of Hellmaster were wiped out nearly in their entirety, and it seems that in order to survive he reabsorbed the power of any remaining, and their shadows in the astral realm.
Therefore while Mazoku can technically be divided into five camps, practically speaking an encounter with a Hellmaster aligned Mazoku is vanishingly improbable.